Which of the following is the proper order of cells for water and minerals to travel from the soil into the xylem?
A. root hair, cortex, epidermis, endodermis
B. endodermis, cortex, epidermis, endodermis
C. root hair, endodermis, cortex, xylem
D. root hair, cortex, endodermis, xylem
E. root hair, cortex, endodermis, phloem, xylem
D. root hair, cortex, endodermis, xylem
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A thin layer chromatogram is useful for
(a) measuring the amount of photosynthesis. (b) determining the amount of gas produced during photosynthesis. (c) separating pigments based on their physical characteristics. (d) determining the presence of sugars in a leaf.
A molecular biologist treats a 600-kb length of linear DNA with HindIII restriction endonuclease. Following gel electrophoresis, the biologist observes that there is only one band on the gel corresponding with the migration distance of the 200-kb molecular weight marker. Assuming that no procedural errors were made, what can be concluded from these results?
A. There were no HindIII recognition sequences present in the original DNA. B. Three HindIII recognition sequences were present in the original DNA. C. One HindIII recognition sequence was present in the original DNA. D. Two HindIII recognition sequences were present in the original DNA.
What is the advantage for birds and mammals of having a four-chambered heart?
A. All of the answer options are correct. B. It allows for complete separation of systemic and pulmonary circulation. C. It allows for complete separation of oxygenated and deoxygenated blood. D. It allows for different pressures in the systemic and pulmonary circuits. E. It allows for increased supply of oxygenated blood to active tissues.
Carbolfuchsin is the ________ in the acid-fast stain
A) primary stain B) mordant C) decolorizer D) counterstain E) fixing reagent